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  • 1
    Electronic Resource
    Electronic Resource
    New types of space-filling polyhedra with fourteen faces (1986)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 282-286 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A study of the staggered packing of identical hexagonal prisms leading to four-connected periodic structures with polyhedral cells of fourteen faces has been undertaken. Special attention was given to those packings that lead to periodic structures with two polyhedra per lattice point, and such that the two polyhedra are related by a pure rotation and/or enantiomorphism. The general solution for packings of this type was obtained and the topology of the intervening polyhedra was determined. It is shown that polyhedra with eight hexagonal faces and six square faces, topologically isomorphic to the truncated octahedron, can be packed with or without a rotation. The polyhedra which can be packed with the respective enantiomorphs (with or without rotation) have four square faces, four pentagonal faces and six hexagonal faces. Each type of packing is compatible with Bravais lattices of any category and each topological solution is compatible with a range of convex shapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767386099300
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  • 2
    Electronic Resource
    Electronic Resource
    A model of fragmentation by nonintersecting cracks (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5157-5160 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A two-dimensional model of fragmentation by randomly (Poisson) distributed and oriented nonintersecting cracks (T junctions) is discussed and the distribution functions of crack lengths and fragment areas are determined. Both distributions are well described by gamma distribution functions, the one for the fragment areas being very close to a pure exponential except at small fragment sizes, the probability of which decreases with decreasing size. The area distribution predicted by the model is compared with that for intersecting cracks, where the probability increases without limit as the size decreases. Differences are predicted for the distribution of fragment sizes resulting from simultaneous (dynamic) fragmentation and successive fragmentation (comminution).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342425
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  • 3
    Electronic Resource
    Electronic Resource
    Thermogravimetric analysis of cork (1988)
    Springer
    Journal of materials science 7 (1988), S. 1064-1065 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720828
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of water vapour heating on structure and properties of cork (1989)
    Springer
    Wood science and technology 23 (1989), S. 27-34 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The effects of heating cork in water vapour at 100°C and 300°C are studied and compared with those produced by heating in air at the same temperatures. Dimensional and mass changes were measured and radial compression curves were obtained following various treatments. The 300°C treatments originate a straightening of the originally corrugated cell walls, while the cell wall material undergoes thermal degradation. Larger swellings and larger mass changes are observed in the treatments in water vapour as compared to those in air. The 100°C treatments do not induce degradation and produce reversible changes in technological properties which are simply due to differences in the water content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350604
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  • 5
    Electronic Resource
    Electronic Resource
    Stress relaxation and creep of cork (1988)
    Springer
    Journal of materials science 23 (1988), S. 35-42 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The stress relaxation and creep behaviour of cork under compression were characterized in tests done with the compression axis parallel to each of the three principal directions in the tree (radial, tangential and axial). All stress relaxations lead to a linear variation of stress with the logarithm of time, the slopes being nearly independent of stress and direction of compression. Creep stresses in the range 0.36 to 1.72 MPa were used. The strain rate continuously decreases during creep, from initial values around 10−4sec−1 to ∼ 10-7 sec−1 after 8 h, but its dependence on the creep stress and direction of compression is not simple, mainly because different deformation regimes may operate during a single creep test. Compression loading-relaxation-unloading cycles were imposed on specimens, with compression either in the radial or in the tangential direction, with the purpose of simulating the performance of a cork stopper. A “work softening” is observed, i.e. the resistance decreases in successive compressions, particularly between the first two. This is explained in terms of an increased undulation of the cell walls produced in the first compression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01174031
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  • 6
    Electronic Resource
    Electronic Resource
    The average rate of growth of individual cells in a cellular structure: Effect of the number of topological elements (1986)
    Springer
    Journal of materials science 21 (1986), S. 2509-2513 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Equations are derived for the average rate of growth or shrinkage of individual cells in two-and three-dimensional cellular structures, when the driving forces for displacement are the excess free energies associated with faces and edges. Curvature effects are neglected. It is shown that in three-dimensional structures, such as polycrystals, cells (grains) with fourteen or more faces tend to grow while those with thirteen or less faces tend to shrink, the rate of growth/shrinkage increasing as the number of faces increases/decreases. In two-dimensional structures, the threshold between growth and shrinkage is for cells with six sides. The specific behaviour of particular cells can be predicted from a simple geometrical construction and can be quite different from the behaviour of the average cell with the same number of edges.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01114298
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  • 7
    Electronic Resource
    Electronic Resource
    The potentialities of a plasticine model of a polycrystal (1986)
    Springer
    Journal of materials science 21 (1986), S. 2264-2268 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A plasticine model of a polycrystal has been constructed with a log-normal distribution of grain sizes. The polycrystal was dissected grain by grain in order to study the topology of the three-dimensional structure. The model was rebuilt with the same grain size distribution and sectioned along various planes. Several parameters of the two-dimensional sections were determined and correlated with the three-dimensional structure. These experiments show the full advantages of this type of model, which have not been exploited previously.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01114265
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  • 8
    Electronic Resource
    Electronic Resource
    Rate effects on the compression and recovery of dimensions of cork (1988)
    Springer
    Journal of materials science 23 (1988), S. 879-885 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A study of the effect of strain rate on the compression behaviour of cork was carried out, which takes into account the anisotropy of the material. Compression curves at three different rates were obtained for each of the three directions in cork (radial, axial and tangential). Strain-rate sensitivity coefficients,m, were also measured in experiments where the strain rate was suddenly changed during the tests. The values ofm are fairly isotropic, around 0.06. For a given strain rate, the radial direction is stronger (i.e. larger stresses) than the other two, but these are not equivalent, the axial direction being slightly stronger for most of the strain interval between 0 and 80%. The recovery of dimensions following compression in each direction was also studied. The change in the three dimensions with time was monitored, following compression to 30% and to 80% strain in a given direction. In the first case, recovery is almost total after ∼ 20 days, but for 80% compression the deformation is not completely recovered after unloading. The recovery rate decreases appreciably with time and increases with the degree of deformation previously imposed. An equation is proposed that describes the recovery behaviour with a reasonable accuracy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153983
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  • 9
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    Stress relaxation and creep of cork (1988)
    Springer
    Details
    Publication Date: 1988-01-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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    The average rate of growth of individual cells in a cellular structure: Effect of the number of topological elements (1986)
    Springer
    Details
    Publication Date: 1986-07-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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